rake info:count

gistfile1.rb

namespace :info do
  desc "Count record each tables"
  task(count: :environment) {
    tables = ActiveRecord::Base.connection.tables
    tables.reject!(&"schema_migrations".method(:==))
    tables.map!(&:classify)
    len = tables.map(&:length).max
    tables.each{|table|
      puts "#{table.ljust(len)}: #{Object.const_get(table).count}"
    }
  }
end